From:
http://www.w3.org/WAI/PF/HTML/wiki/Verbose_desc_reqs#Requirements
"A programmatic mechanism to reference a specific set of structured
content, internal (enhanced describedby model) and external (HTML4
longdesc model) to the document containing the described image."
Why is being able to reference an external resource an accessibility
requirement?
For the sake of argument, imagine HTML included a "description"
element with a "for" attribute that could reference the "id" of an
image. Imagine "description" elements were displayed or not displayed
based on user preference or user interaction with the image.
What need of people with disabilities would this not be meeting?
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Benjamin Hawkes-Lewis